Earlier today we announced several exciting new additions to Google+, including open signups. We’d like to announce one more addition for our AdSense publishers, +1 on the Google Display Network.

Starting in October, the +1 button will begin to appear on display ads on your site. With a single click, people will now be able to endorse specific ads and make them more likely to appear to their social connections. We believe that these recommendations could lead your readers to notice ads on your site more, leading to more clicks and higher returns for you over time.

For example, take Susan, who sees an ad for a good deal on flights. She +1’s the ad, thinking her friends might value this deal. Now, when Susan’s friends and contacts are signed in to their Google accounts, they’ll be able to see Susan’s picture across the bottom of the ad, with a note saying she +1’d it.

The +1 button and recommendations will appear at the bottom of display ads.

Susan’s friends and contacts will also be more likely to see the ad. While the dynamics of our ad auction aren’t changing, the ad will now be included in the auction for the pages Susan’s friends visit, as we know recommendations from friends can be a strong signal of an ad’s relevance.

+1’s will be one additional signal that help determine an ad’s relevance. All eligible ads will continue to compete in the ad auction, and we’ll continue to show the ones that will generate the most revenue for you. +1 button clicks are not counted as clicks on ads. Although you won’t receive any revenue for +1 button clicks, +1’s will help AdSense to deliver more useful ads to your users, which we think will result in higher returns over time.

On mobile, the +1 button will replace the existing ‘g’ logo and recommendations will appear for several seconds, then fade out.

The +1 button will begin to appear on AdSense for content and AdSense for mobile content display ad formats--image, animated gif, and Flash ads. If you’d prefer not to allow the use of +1 features and social annotations on display ads on your pages, you can opt out starting today by signing in to your account at google.com/adsense.

Display ads become much more powerful when people can see which of their connections have chosen to endorse them, leading to a better advertising experience and higher returns for you.

If you’d like to learn more about the +1 button on display ads, please visit the AdSense Help Center.